Chapter 22 Evil love

Don't be surprised if a medical examiner tells you that he hates the sight of dead and mutilated bodies.That didn't mean that he was cowardly and incompetent for his job, but that he really didn't want such a tragic murder to happen in the world. I have been practicing for 12 years, and I have always adhered to this idea, but unfortunately, during these 12 years, I have been exposed to countless homicide and violent cases. So when I was called on June 17 that the body of a woman, Devin Gizman, had been found in an abandoned parking lot near the Easton train station, I couldn't say how sad I was.

I arrived at the scene to see Devon Gizman being carried out of her new car with a deep gash in her throat. But now, we are faced with a thorny conundrum, did this young woman commit suicide or was she murdered?There is a sign hanging at the entrance of the parking lot that reads: Pets must be kept in custody.So, who should be in charge of the death of this woman who has come here? This place has been designated as a crime scene, and we have put up a "no entry" cordon.I got to work, hoping that as our investigation progressed, the case would be cracked. We now know that two women have found here before the police arrived. They were the first to find Devon's car and Devon's body, so they called the police.The two women who called the police heard that they were good friends of Devin, one was named Kerry and the other was named Michelle.They were sad, and yes, it's not normal not to be sad when you find out your best friend is dead.With tears in their eyes, they said: "Halloween's Day will be in another four months. I heard German once said that we should stand in the pile of pumpkins and take a photo (because October 31st is a traditional western festival called Halloween. Making pumpkins Lanterns are one of the traditional customs of Halloween.), but now, she is no longer there."

I handed over a tissue and said, "Okay, then I'll ask the two ladies to help us investigate." Kerry and Michelle found Devin's new car in the parking lot before the police arrived. When they walked to the car, they found that Devin's lips and eyebrows had turned purple and had been dead for a long time. . It was terrible, neither of them expected such a thing to happen, so they shook Devin hard and called her name, but she still didn't respond.They couldn't control their emotions and yelled. At that time, their minds were blank. This is obviously not good news for us, which means that someone has moved at the scene of the deceased.Therefore, we need to be very careful when investigating, and we must take all the traces back for investigation one by one, and exclude some things that have nothing to do with the case, and the rest may be the evidence left by the criminals.

My colleagues found a syringe inserted into Devon's waist at the scene. From the surface analysis of the body, it seems that the woman named Devin died of drug abuse.Drugs are not fun. When you are infected with it, if you want to quit, it is very, very difficult, and it is very painful to quit. The syringe in Devon's waist was empty, though.In Devon's hand, there was a small knife, and there was no blood on the blade.Moreover, the size of the knife can also show that the knife is not a murder weapon.No blood was found at the scene of the death, and Devon's pants were covered with mud and weeds, which further confirmed my speculation.Devon didn't die here, so it's just a second crime scene, and she was definitely put in the car by someone else.Obviously, the criminals did this to mislead the police and divert their attention.It is very close to the train station, but the surrounding area is very empty. Maybe everyone knows that this is an abandoned parking station, so few people usually visit it.There are some messy grass growing here, and there are also piles of dirt and some broken bricks. The dirt road is also high and low, and there are things around it, so that this place can be distinguished from other places.

Therefore, we can basically conclude that this is a murder.Devon is still covered with her own coat, which is a bit of an inspiration for us.We don't know who covered her with this coat, but this person covered the coat very carefully. The coat started to cover the neck of the deceased and continued down, and the bottom end of the coat reached the deceased. knee position.This method of covering does not seem to be the kind that is inconsiderate and caring in a panic.I think the criminal should be a kind of cover method that is light and with a little nostalgia.So, it means that the person who covered the deceased must be very familiar with the deceased, and not in the general sense.

I made such an inference just to find out what the relationship between the deceased and the man who covered the coat was.I think it will take time to sort it out.But my thinking like this is of practical significance to the investigation work, that is, we will not take more detours in the detection.You must know that taking an extra detour in the detection is a very painful thing when you understand it.Therefore, we reminded ourselves from the very beginning of solving the case that we must not be misled by criminals.Therefore, I have seen on the scene that criminals are using false appearances to confuse and mislead us.But unfortunately, his trick was seen through by us.

The relationship between perpetrator and victim is extraordinary.We usually think about it between friends and close friends. People who can put their dearest friends to death must have encountered some particularly difficult problems to solve, and this problem has reached the point of no delay.If there is no better solution for a while, the criminal will have the idea of ​​killing.Killing and being killed, or it seems to be the relationship between one thought, and this so-called moment, it will tell us that restraint and patience are too much needed to be a human being.However, there are still people who are willing to do some risky things like this. This is a thing scarier than drug use, but it still happens all around us.

From this point of view, in the case of Devon, we should start to understand the situation from the people who have the closest relationship with her, and then gradually expand the investigation to a certain scope. I tested the empty syringe and it turned out that there were no traces of drugs in Devon's system.The main purpose of my inspection is to conduct safety evaluation on samples such as chemicals in the syringe according to relevant technical standards or specifications. Soon, Devon's roommate Kerry Rayner was brought into the police's sight.She and Devin used to be a pair of lovers, which is what we often call gay.Homosexuality is defined as a person whose erotic, psychological and emotional interests are primarily directed towards people of the same sex.They or they have such interests, some of which will show through outward behavior.Those who have love, sexual desire or love with the same sex, we regard these people as homosexuals.Homosexuality has experienced a development process from "crime" to "tolerance", and now it seems that it has a certain historical significance.

Kerry told me that Devin was everything to her, and she burst into tears the moment she found out that Devin was dead.She said that she loved Devon very much, and that the two of them really loved each other.However, on the night of the murder, they had a violent quarrel.Whether this quarrel contributed to Devin's disappearance from then on is unknown.Because Devon was found dead the next morning after the quarrel with Kerry, and the time between the quarrel and the discovery of Devon's death was only eight to ten hours.The quarrel between the two happened at 9:30 last night.One witness was willing to testify in this way, because he was enjoying himself in the bar downstairs.

I infer that the quarrel between Kerry and Devin is nothing more than jealousy.According to the investigation, their quarrel was so loud that the customers in the bar below the apartment could hear it clearly.That bar mainly serves Western food, and has unique ways of cooking meat, seafood and game, so the business is very good.Customers have a special preference for the beef there, such as BBQ beef.And customers are chatting while eating.But on this day, some customers said that they couldn't eat anymore, because the noise upstairs was so loud that they even heard the sound of smashing things.

Yes, those customers heard the banging and shouting, and there were also customers who ran up and down and said, "It's okay, it's two girls fighting." When we asked about it, Carrey didn't deny it.Kerry said they were arguing very hard at the time.Girls fight, you know, it's just pulling each other's clothes and hair and throwing bottles and all, and they did that night.Kerry said Devon left the apartment after their fight, saying she had nothing to do with Devon's death. "Really, I swear, it really has nothing to do with me." Kerry said, waving at us.She wants to prove her innocence. "What time did Devon leave the apartment?" we asked Kerry. To this question, Kerry said she was too confused to check her watch, so she didn't know exactly when Devon left the apartment. The name of the apartment they lived in was Mineral Spring Apartment.We decided to conduct a more detailed examination of the interior of the apartment.Devon's family members believe that the murderer is Kerry.Devin's father said that Kerry was usually very rough with her daughter, always abusing and abusing her. When he learned that Devin was killed, his first reaction was: this woman named Kerry murdered Devin.Devon's father was so sad that he couldn't even speak in staccato. Kerry only admitted that she had had a quarrel with Devin on the night of the murder, and she denied that she had anything to do with the murder. But we found Devin's car mat in the shower at Kerry's apartment.Apparently, the mat had only been washed recently.Kerry said that the mat was washed by Devin, and she thought it was too dirty.Kerry said that people who have cars, especially those who live in apartments, have the habit of washing the floor mats, so she thinks this is normal. I then sprayed luminol under the shower mat to see if there was any blood there.The luminol I use is also called luminol, and it has a chemical name: 3-aminophthalohydrazide.It is a relatively stable synthetic organic compound in the form of yellow crystals or beige powder at room temperature.As for its chemical formula, we can omit it.However, its solution is strongly acidic and has certain irritating effects on the eyes, skin and respiratory tract.Because hemoglobin contains iron, iron can catalyze the decomposition of hydrogen peroxide, and turn hydrogen peroxide into water and monooxygen, while monooxygen re-oxidizes luminol to make it glow.So luminol is mainly used for our on-site blood testing. To our surprise, tests showed that the blood found in the shower was that of the victim, Devin Gizman.The test result is positive.However, Kerry still does not admit that he killed Devon. According to my speculation, the first scene of the murder may be in Carrey's shower.Kerry then transferred the body to the car and accidentally left bloodstains during the transfer.The blood was left on the car mat, so Kerry took it up and rinsed it. We then rushed Kerry to Police Headquarters, where she underwent a lie detector test, and we believed she was a suspect. The word "polygraph" comes from "polygraph". The original text of "polygraph" is "multiple recorder". It is an instrument that records multiple physiological reactions. It can be used to assist in the investigation of criminal investigations. It can also understand the psychology of the suspect being questioned. Circumstances, thus, we can judge whether Kerry is involved in the case. Since most real criminal suspects deny their involvement in the case and lie, it is called "polygraph".To be precise, "lie detection" does not measure the "lie" itself, but the changes in physiological parameters caused by psychological stimulation.Therefore, the scientific and accurate name of "polygraph" is "multi-parameter psychological test", and "polygraph" should be called "multi-parameter psychological test". I was there at the scene, and I saw Kerry was very scared, she didn't know what to do, but she still said she would not give in, she even believed that she would be fine, she said she did not kill Devon. We didn't pay much attention to what Kerry said, and let the facts speak for everything and let science verify it. This lie detector that we use at present is made up of sensor, host computer and microcomputer.When the sensor is connected to the human body surface, it will collect information on changes in human physiological parameters.The host is some electronic components, which process and convert the analog signal collected by the sensor into a digital signal.The microcomputer mainly stores and analyzes the input digital signal, and obtains the lie detection result. Take a milky white PG-7 multi-parameter psychological tester as an example, it only has the size of a 32-carat book, and it consists of three parts: a sensor, a host computer and a microcomputer.The sensor has 3 tentacles.The electrodermal sensor worn on the human finger is a stainless steel electrode used to measure changes in skin resistance; the respiratory sensor is a stretch sensor, which is tied to the human chest and mainly measures changes in human breathing; pulse and blood pressure The sensor is a pressure-sensitive sensor or sphygmomanometer, which is worn on a person's wrist or arm, and it measures changes in a person's pulse and blood pressure.The role of the host is to convert the analog signal collected by the sensor into a digital signal after processing, and then input it into the computer for storage and analysis. To be precise, polygraph technology is a kind of psychological testing technology.The so-called psychological testing technology is the psychological analysis completed by combining bioelectronics and psychology with the help of computer means. Of course, we will analyze the suspects according to the theory of psychology. When Kerry experiences a special event, without exception, he will leave an indelible mark on his mind.For example, if the suspect Kerry commits the crime, as time goes by, she will repeatedly reproduce various scenes of the crime in her mind, and she will ponder over the traces she may have left, and she will not be able to restrain herself even if she doesn't think about it.Whenever someone mentions some details of the crime scene, Carrie's imprint will be exposed through various biological reactions such as breathing, pulse and skin.This subtle response is recorded by the test instrument and then pooled to form a conclusion of either knowing or participating. According to this principle, the psychological testing technique not only allows the answer "yes" or "no" during the test, but also allows the subject to answer in silence. At this time, we also knew that the lie detector could not directly detect Carrie's mind. I prepared a series of questions in advance according to the content of the investigation, and then asked the testee Carrie one by one.The questions involved in polygraph detection are mainly divided into three categories: the first is neutral questions that have nothing to do with the investigation event; the second is related or thematic questions related to the investigation event; Again, the yardstick or control question will definitely lie. Our polygraph experts generally do not face the testee Kerry face to face, their eyes are mainly fixed on the graph on the computer monitor, and at the same time we will pay attention to the facial expression of the testee Kerry with peripheral vision.Again, the tone of the polygraph expert's voice has no emotion, a mechanical voice. In this way, we can use the polygraph itself to create a certain amount of psychological pressure on Kerry, prompting the suspect to waver, explain the problem or explain the truth of the facts. The polygraph staff repeatedly explained and emphasized the scientificity, objectivity, fairness and effectiveness of the polygraph to Carrie, and used Carrie's sense of mystery about the polygraph to make her feel that the polygraph is sensitive and cannot be deceived. Yes, she will worry that if she tells a lie, she may be seen through and exposed on the spot, exposing herself, which will aggravate her psychological pressure. In some cases I have handled in the past, I found that some criminal suspects confessed their crimes during or shortly after the test.Of course, the actual lie detection process is far from straightforward.A polygraph test to investigate crimes can take 3 to 4 hours, of which only about 15 minutes are spent on physiological measurements, and most of the rest of the time is spent reviewing questions, pre-test interviews and explaining procedures and critique and discuss the measurement results. Before the official measurement, I had a long conversation with Kerry.My purpose was two at that time, one was to understand the personality and honesty of the subject Kerry through conversation and interrogation, so as to finally determine the interrogation questions and interrogation methods during the formal measurement; the other was to introduce the polygraph to the subject The "consistent correctness" of the polygraph makes Carrey believe that the polygraph has a reliable function of accurately distinguishing truth from lies, thus creating a deterrent effect on Carrie and eliminating her chances of luck. In order to convince the examinee Kerry that the polygraph cannot be deceived, as a polygraph examiner, I also asked the examinee Kerry to participate in a demonstration verification.I asked her to randomly choose a card from a deck and mix it with other cards.When the examiner took these cards and asked Carrie one by one, "Is it this one?", she always answered "No!" The lie detector always correctly pointed out which card Kerry drew, and at the same time told Kerry that this was based on the measurement of physiological changes in the polygraph's response to him.In fact, these cards are usually marked by us in advance. The questions we design have different relationships with the subject of the lie detection, and will form different psychological stimuli to the person being tested, thereby triggering her different physiological reactions and causing her a series of physiological parameters, such as myoelectricity, pulse, blood pressure, respiration , heartbeat, brain wave, voice, pupil and other changes.At this time, we use instruments to measure the changes of these parameters to record the change map, and then analyze the map, so that we can judge whether the tested person Kerry's answer to the question is "honest" or "lying". Therefore, when it comes to this, what can really affect the test result is the nature of the case, whether the case information is sufficient and other factors. Anti-test training will not affect the test results. However, with regard to the fact that polygraphs can completely detect "lies", our understanding is that we cannot say that all lies can be broken. It should be said that within the scope of the identified suspects, basically through This psychological test can find him out. In fact, the lie detector is not a panacea.On the one hand, whether the polygraph can play a normal role is closely related to the external environment of the test, the individual status of the testee, the level of the tester, and the design of the questions.Some tests will end up with nothing because of insufficient conditions.We've been in this situation before. However, the test on Carrey was negative.She answered all the questions calmly, and according to the results displayed by the instrument, she was telling the "truth". But Kerry is still suspected of committing a major crime, because traces of a struggle and Devon's blood were found in her room, so we can't rule her out yet.